Only the sort of people who often receive this "compliment" often can possibly think that it is one.
"Never to fail" is positive.
"Never to fail" to do something negative, like disappoint, isn't positive.
The whole sentence contains a triple negative: never + fail + dis, which amount to a negative.
It is a veiled insult: an ironic form of insult delivery which is misinterpreted as flattery to the buffoon who is targeted by it, much to the entertainment of anyone else within earshot who understands the true meaning.
My glam team doesn't fail to disappoint and they took the Monday blues and turned it into a stunning look any girl would love.
Is basically incorrect, not to mention a clumsy use of a coordinating conjunction. You want something like the following, with a different word in place of "disappoint", like "deliver":
My glam team, who never fail to deliver, took the Monday blues and turned into a stunning look any girl would love.
Christina is clearly not the brightest bulb in the chandelier.